SCHEMA-345. End-to-end test running KijiSchema unit-tests against a real HBase.

- shared base modules in kiji/ : command, bento_cluster and maven_fetcher.
- copy kiji/base from the dev tools.
- refactor kiji_music test to use the shared modules.
- add kiji_schema test to run unit-tests against a real HBase instance.

issue: https://jira.kiji.org/browse/SCHEMA-345
review: https://review.kiji.org/r/352